<template>
  <el-tree :data="categoriesData" props="defaultProps" show-checkbox node-key="id" default-expand-all :expand-on-click-node="false" :render-content="renderContent"></el-tree>
</template>
<script>
  let id = 1000;
  export default {
    data() {
      return {
        categoriesData: [{
          id: 1,
          label: '一级 1',
          children: [{
            id: 4,
            label: '二级 1-1',
            children: [{
              id: 9,
              label: '三级 1-1-1'
            }, {
              id: 10,
              label: '三级 1-1-2'
            }]
          }]
        }, {
          id: 2,
          label: '一级 2',
          children: [{
            id: 5,
            label: '二级 2-1'
          }, {
            id: 6,
            label: '二级 2-2'
          }]
        }, {
          id: 3,
          label: '一级 3',
          children: [{
            id: 7,
            label: '二级 3-1'
          }, {
            id: 8,
            label: '二级 3-2'
          }]
        }],
        defaultProps: {
          children: 'children',
          label: 'label'
        }
      }    
},
    methods: {
      append(store, data) {
        store.append({ id: id++, label: 'testtest', children: [] }, data);
      },

      remove(store, data) {
        store.remove(data);
      },

      renderContent(h, { node, data, store }) {
        // return (
        //   <span>
        //     <span>
        //       <span>{node.label}</span>
        //     </span>
        //     <span style="float: right; margin-right: 20px">
        //       <el-button size="mini" on-click={ () => this.append(store, data) }>Append</el-button>
        //       <el-button size="mini" on-click={ () => this.remove(store, data) }>Delete</el-button>
        //     </span>
        //   </span>);
      }
    }

  }

</script>